I use 5 150 watt HPS lights. They seem to do a good job for my 16.5 foot boat. They barely load my 3250 genny and they don't get near as hot as the 500 watt halogens. I am very satisfied with them. My genny will run for about 8 hours on 2 gallons. Over time you will get back the extra money you spend, up front,in gas savings. Especially at $4 per gallon.